The Causeway bridge New Orleans, Louisiana spanned Lake Pontchartrain to connect
New Orleans to the mostly rural, sparsely populated St. Tammany Parish.
The first span was built in 1955 - 1956 and opened August 30, 1956.
The second span was built in 1967 - 1969 and opened May 10, 1969.
The northbound span extends 23.87 miles and the southbound 23.86 miles.
The Causeway is the longest overwater highway bridge in the world.